## Geometry - PolygonsThe word "polygon" derives from the Greek πολύς ("many") and γωνία (gōnia), meaning "knee" or "angle". Today a polygon is more usually understood in terms of sides. - Wikipedia K = area r= radius of inscribed circle R = radius of circumscribed circle p and q are diagonals n= number of sides θ = one of the vertex angles
Source: CRC Standard Math Tables, 1987
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